3.5" Bay to Dual 2.5" SATA HDD Adapter. "The SATA35252X 3.5" "Bay to Dual 2.5" SATA HDD Adapter allows one or two 2.5" SATA I/SATA II hard drives to be installed into a single 3.5"" drive bay and connected to the host computer in place of a 3.5" SATA hard drive. This convenient storage solution includes a 4-pin HDD to SATA power adapter cable to ensure a seamless installation."